Vehicular high pressure direct injection type injector with valve seat body for fuel-atomization

Abstract

Disclosed herein is a vehicular high pressure direct injection type injector with valve seat body for fuel-atomization. A nozzle hole has an elliptical cross-section so that the fuel injection speed can be increased, whereby a fuel atomization effect can be maximized. Furthermore, a stepped hole is formed under the nozzle hole so that the nozzle hole can be fundamentally prevented from becoming clogged with combustion byproducts.

The invention claimed is: 
     
       1. A vehicular high pressure direct injection type injector with valve seat body for fuel-atomization, the injector comprising:
 a cylindrical housing having a needle valve therein; 
 a magnetic coil arranged for reciprocating the needle valve; 
 a current supply line arranged for supplying current to the magnetic coil; 
 a return spring disposed at an upper end of the needle valve, the return spring arranged for applying a restoring force to the needle valve; 
 a valve seat body disposed at a lower end of the cylindrical housing; and 
 a ball disposed between the valve seat body and the needle valve, 
 wherein the valve seat body includes:
 a valve seat surface structured to accommodate the ball in a seated position, 
 a nozzle hole located under the valve seat surface in a direction in which fuel is injected, and 
 a stepped hole formed under the nozzle hole in the direction in which fuel is injected, the stepped hole having a horizontal cross-sectional area that is greater than a largest horizontal cross-sectional area of the nozzle hole, each of the horizontal cross-sectional areas being in a plane perpendicular to the direction in which fuel is injected, 
 
 wherein a horizontal cross-section of the nozzle hole is shaped as an ellipse having a minor axis to a major axis ratio in a range of greater than 1:1 up to 1:3.5, and 
 wherein the nozzle hole has a reverse truncated conical shape with a side surface that is tapered in the direction in which fuel is injected, such that the horizontal cross-sectional area of the nozzle hole decreases in the direction in which fuel is injected. 
 
     
     
       2. The vehicular high pressure direct injection type injector with valve seat body for fuel-atomization as set forth in  claim 1 , wherein the valve seat body includes a plurality of the nozzle holes.